Doorcheck



Feb. 28, 1933. w FOSTER 1,899,266

DOORCHECK 'Filed June 6, 1931 4 lfl QIVENTOR,

ii 1/112 ij it 7 BY WmzZ' 3 ATTORNEYS.

y forth in said claims. i

' 45.2 which Patented Feb. 28,: .1933.

: WALTER r. ros'rEB, or SAN PATENT-OFFICEI mmncrsco, cALIroRNIe, Ass'IGNoR- T connoa com-ANY; ,A-JCOBPORATIONJOFF-NEVADA nooaonncKQ Application. mm;

glycerine, for example, whose viscosity changes very little with variations in tem perature, thereby eliminating "the necessity for frequent adjustment. 'It also prevents a loss of fluid "with consequent necessity for 'refilling, and prevents the unsightly effect caused by even a small leakage of the operngfl i i Other objects of the invention are'to provide a device whichis simple and inexpensive to manufacture and assemble, which is easy to adjust to varying degrees of "resistance, and which is capable of positive operatlon over a long period of time without attention. Although the preferred location ofmy door check is "in association withthe door hinge, as described and-illustrated herein, it should be understoodthatit maybe located in any positionin which its-construction will permit suitable operation. It should also be,-

noted that the form, construction and 'ar-- rangement of the several parts, hereinafter described'and shown in the accompanying drawing, may be varied within thelimits of 40.1 the claims hereto appended, without departingfrom the spiritaof the invention as set A preferred form of the-invention isil-I- lustrated in. the accompanying-drawing in Fig. lisja longitudinalvertical section of thedoor check.

Fig; 2 is a transverse 2 2of Fig. 1.

section on the line Figs.:'3 and4 areltransverse sectional de to or com 193 s am... 542.592.

tails taken on'the respective lines; 3 -3 and 4-.4 ofFigal, and enlarged.-

. F ig.; 5 is a part sectional plan View show- .ing arpre ferred method of mounting my door- In the drawing, and referringforthe moment to Fig. 5 thereof,,the referencenumerals land 2 designate portions of audoor and its 1 frame orrcasing. Either may be regardedlas the door'and the other as the casing. 3 and3 are the two members or plates of the door hinge, herein shownas of the butt type. 4 8

1s a stud projecting from and preferablysecured t0 the hinge plate 3. 5 is the shell of thedoor check,.wh'ich is of greater height I thanwidth, and is adapted for insertion in the door (or casing) 2. This shell has a front wall or face 6,.Fig. 1, adapted to lie beneath or behindthe hingeplate 3, and pro vided with apertured lugs 7 by which it is bolted to said hingeplate 3', as indicated at 7inFig.5. o

In the upper portion of the shell 5 is a guide barrel 8, Fig. 1, having a forward portion 9 a of reduced diameter. 'A plunger 10 operates within the barrel 8 and is carried upon the I rear. end of a stem 11 which extends through the guide9 and proj ects forwardly therefrom for contact with the opposing stud 4, as shown 1 i in Fig. 5, so that the stem 11 and plunger '10 are moved rearwardly, that is, toward the right in F ig. 1,1by the closing of the door.

In the lower portion-v of the shell-.5 is a cylinderi12 in which the checking fluid is compressedby the forward movement of a piston 13.- The piston 13 is connected I withv the pin 16 passes through the lever 15 and is seat- I ed'inopposing bosses 18 projecting inwardly from the side walls of the shell. The upper.

plunger 10 by a linkll and a lever 15, the latter being pivoted upona pin 16.- The pin 16 I the shell5. Thecylindrical portion of the I 8 end of the lever 15, extends through a longitudinal slot 19 in the bottom of the guide.bar-' rel 8 and bears against the rear, face of the plungerlO. A-springQO moves the plunger 10 forwardly and, the piston 13 rearwardly."

vided with an elongated loop 22' surrounding the lever 15 and retained in positionthereon by a notch 23.

The forward end of the cylinder 12 is closed, preferably by a screwplug 24 and a suitable gasket 25. A port 26 leads upwardly from the forward end of the cylinder 12 and communicates with a rearwardly extending passage 27 in which is formeda valveseat 28.

A needle valve 29 is positioned within the passage 27 for contact with theseat 28 to regulate the effective area of said passage. The forward endof the needlevalve29 is provided with a threaded? head 30', whchis=accessible from the front face 6 of the shell upon theremoval of a sealing plug'31. Theneedle valve 29 is preferably provided with a tapering v-shaped slot 32 which increases in area toward the rear end of said valve. The purpose of this sl'otis to decrease the variation in the effectivearea of thevalve upon any given movement of the needle, in other words, toprovide a fine adjustment of the valve area with. considerable movement of the needle.

The piston 13 is provided with a check valve comprising a disk 33 positioned to cover and'uncover a plurality of ports 34." The disk33 is freely mounted upon a stem 35 and is held against its seat by a spring 36. When the piston 13 moves rearwardly under the impelling action of the spring 20, that is, upon the opening of the door, the fluid flows freely through the ports 34 into the cylinder 12, but

upon the closing ofthe-door. when the piston 13 moves forwardly, the fluid within said cylindercan escape only through the needle valve controlled passage 27. Adjustment of the needle valve 29 variesthe resistance ofthe 45 fluid to said forward movement of the piston.

The cylinder 12 has a longitudinally tapered V-shaped groove 37 in its wall, extending for wardly from its rear end and decreasing in area toward the front.

"the'piston during the first portion of its forward movement, snobby-passing efl'ect dew creasing as the piston moves forwardly. The

resistance to the closing of the door therefore takes effect gradually, in order to relieve the hinges of any sudden strain.

The interior ofthe shell 5 forms a reserwithin the lowerp'ortion of. the shell 5, and- This groove bypasses a portion of the checking fl'uid around never rises into the plunger barrel 8. Moreover, there is little pressure in the reservoir portion of the shell. Therefore, any simple packing, as indicated at 41, around the plunger stem 11, is sufficient to prevent such; fluid as may splash up on to the plunger andits stem from leaking ,out around said stem. It is to be noted, however, that the packing 41 seated around the stem 11, between theannular opposing faces or shoulders of the piston 10 and the barrel abutment has the further important function of positively preventing leakage of the internal fluid under-positional changes of the device other than the position just mentioned in which the fluid lies 11H the lower; portion of the shell.

Suclrother changes of position are those. which, in preliminary handling,pack1ng,sh1pping, preparation for setting,- etc., may have the'eli'ect of temporarily inverting, wholly or. partly, the device and causing' 'the fluidto enterthe barrel 8. Inany suchcasethe packing 41 provides fora perfect seal against fluid It isalso to benotedthat the entire leakage. shell is closed so that there can be no evaporationof the fluid. The'piston and cylinders are in thelowest portion of the shell,-entirely submerged in; the fluidat all times, so that the checking action ofthe fluid cannot be lessened- 0r destroyed by *air bubbles in the cylinder 12. I

The rear end of theshell 5 is preferably a [removable plate 42, secured in place to make a-fluid tight oint by any suitable means such as screws-indicated at 43. This construction permits the shell to be'cast and machined with a minimum amount of labor. The barrel -8 can be bored inrfrom therear end,'the guide portion9 can be bored straight through, and

the cylinder 12 can also be bored straight.

through to insure its accuracy.

In assembling the device, the plunger 10 and its stem 11 are first put in place from the rear end of the shell. The spring 20 .is then secured to the front wall of .the shell by means of a screwdriver extended into it; The

piston 13, the link 14 and the lever 15 are then assembledoutside the'shell and are introduced into it from the rear, the upper end of the lever 15'being passed through the loop 22 at the rear end of the spring 20. The pivot pin .16 is then inserted from-the side. The forwardend of the cylinder 12 is closed by the screw plug 24 and gasket 25. The needle valve29 is placed inposition from the front,

and the rear plate 42 isflattached to the rear end of theshell. After the device has been filled with fluid and the needle valve adjusted to the proper point, the screw plug 31 is' inserted and screwed home against a gasket '44 to prevent leakage of fluid aroundthe head of said needle valve. No further attention need be given the device except tovary the adjustment of the needle valve asmay be required to suit the particular conditions under positioned above the'level of the liquid in the shell, but also allows said plunger to'have a longer stroke in relation to that of the piston. Bythe use of the stud 4, which extendsinto the guide 9 when'the door is closed, contact can be established between stud and plunger when the door is nearly '90? open, thuskeeping the door under control throughout half' of its total movement, Since comparatively few doors are opened more than 90, my check provides control throughout themost used portion of the doors movement'.;

1. A door check comprising a fluid containing shell having greater height than width and adapted for insertion in afdoor or.

casing, ,said shell having a guidebarrel in its upperportlon'and a cylinder in its lower portion, said barrel extending from front to rear of said shelland having a longitudinal,

slot in its bottom wall, and said cylinder communicating with the interior of said shell a plunger movably mounted in said barrel and projecting through the, front wall of said shell; :1 piston movable in said cylinder and adapted to circulate the fluid between said cylinder and the interior of said shell; alever connecting said plunger and said piston, said lever being pivotally mounted'within said shell and having its upper end operating through the slot in said barrel and engaging the rear end of said plunger; and'means for restricting the circulation of said fluid.

2. A door check comprising a fluid'con:

taining shell having greater height than width and adapted for insertion ina door or casing,.said shell having a horizontal guide barrel in its upper portion and a cylinder in its lower portion, said cylinder communicating, with the interior of the shell; a;

plunger movably mounted. in said barrel and projecting through the front wall of said shell; a piston movable in saidcylinder and adapted to circulate the fluid between said cylinder and the interior of said shell; a lever pivotallymounted between its ends within said shell,the lower end of'said lever being connected with said piston and itsupper end bearing againstthe rear end of said plunger;

a tension spring connecting the upper end portion of said lever with the front wall of said shell; and means for restricting the cir culation of said fluid. a

3. A door check comprising afluid contain ing shell having a socket in its wall; a cylinder within said shell having a passage connecting with the interior ofthe shell; an ad- 24 are accessible justable needle valve adapted to control said 1 passage, said valve having an adj ustin'g head seated within said'isocket; a closure for said socket adaptedto cover said head'and prevent exterior leakage of fluid-through and from said socket; a piston in said cylinder;

and means for movingsaid piston from out side said shells 4. A door check comprising a shell of greater height than width and having a front;

wall and an open rear end, said shell further having a horizontal guide barrel formedzin its upperportion and a horizontal cylinder formedin its lower portion, said barrel and I said cylinder extending through said front wall, and said cylinder communicating with the interior of said shell; va separable closure for the'rear end of said shell adapting it to contain a supply of. fluid; a closure for the front end of said cylinder; a plunger movable "in said barrel and extending throughthe front wall of the shell; a piston movable in.

said cylinder; a lever pivotally mounted within said shell connecting said plunger with said piston; and means for restricting the flowoffluid between said cylinder and the interior of the shell. upon movement of V- said piston. e

5. A door check comprising a fluid-containing shell having a guidebarrel in its upper portion communicating with the shell interior, one end of said barrel Y opening, through the front wall of the shell and being of reduced diameter to form an annular internal shoulder; a plunger slidable in the barrel,said plunger having a shoulder adapted to abut against the shoulder of said barrel and a reduced stem portion 'slidable through the reduced portion of the barrel; a packing interposed between said shoulders; a cylin- ,der in'the' lower portionof the shell communicating with the shell'interior; a valved pis-v ton slidablein the cylinder;'and a lever piv-.

oted within the shell with its ends engaging a v 110 V i '6. Af'doorcheck comprising a fluid con said plunger and piston respectively.

taining shell adapted for insertion in a door.

or casing,

being oflarger diameter" than its forward portion and having a longitudinal slot formed in" its bottom wall; a pressure cylinmunicating with the interior thereof; a,

plunger slidably mountedin said barrel, the

forward portion of said plunger extending through the reducedforward portion of said barrel, and the rear portion of said plunger beingof larger diameter than said forward a portion and operating in the slotted rear portion of said barrel; a piston movable in said cylinder to circulate the fluid between said cylinder and the interior of the shell; a lever connecting plunger and said piston, said said shell having a guide barrel in itsupper portion extending from front to rear, and the rear portion of said barrel der in the lower portion of saidshell coinlever being pivotally mounted within said) shell and operating through the slot in said barrel; and means for restricting the circulation of said. fluid. 1

' In testimony whereof I have signed my name to this specification.

WALTER F. FOSTER. 

